[ithacaartist]

I also initially thought that these mag bodies were "extruded"--the result of their material's being pushed through a die to create a continuous tube with proper cross-section. I think it was John Sabato who corrected this info for us. His description of a forged general form--created by pushing/hammering on tubing stock (can be done either hot or cold)-- which was then machined to achieve the properly relieved areas on the exterior, is probably more accurate description of how they were manufactured. (Extruded aluminum requires way less mechanical energy invested in the process.)

So, now, I kind of wince every time I see "extruded" used to describe these fxo mags--kind of like when seeing "clip" when "magazine" is the real term intended!